Properties of rare earth modified Fe-based composite coating on Cr12MoV steel surface by laser cladding

doi:10.13251/j.issn.0254-6051.2022.07.040

Abstract

Abstract: CMC PMagic2L coating was prepared on the Cr12MoV steel surface by laser cladding technology, and the modified Fe-base composite coating was formed by adding rare earth oxide CeO₂. The effect of adding rare earth oxide CeO₂ on microstructure and properties of the coating was studied by means of optical microscope, scanning electron microscope, microhardness tester and friction and wear testing machine. The results show that CeO₂ can improve the grain refinement of clad layer and enlarge the width of heat affected zone. The hardness of clad layer increases with the increase of CeO₂ content. Compared with the coating without CeO₂, although the thickness of the heat affected zone increases, but the average hardness of the clad layer in modified Fe-based composite coating with 1%CeO₂ increases by 22.1%, the wear resistance is also significantly improved, and the wear volume is reduced by 43.66%. The clad layer has compact structure, which can effectively achieve the purpose of surface strengthening of the die.

Key words: laser surface strengthening, composite coating, rare earth oxide CeO₂, Fe-based powder, hardness, wear resistance

CLC Number:

Dong Xiaochuan, Pan Gaofeng, Li Yang, Wu Runmou, Zhou Zheng, Zhang Xiaoyan. Properties of rare earth modified Fe-based composite coating on Cr12MoV steel surface by laser cladding[J]. Heat Treatment of Metals, 2022, 47(7): 234-240.

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